Piston ring compressors

[01xdime]

What piston ring compressors are people using? I'd like to use ARPs tapered bore specific compressor but they dont have anything metric thats the right size. Would a 4" or 3.9" one work? I believe the 4 tecs bore is something like 3.93 inches.

[Mark S]

I got one from Summit Racing. Worked fine and not too expensive. Here is a link to the exact one I ordered.

Mark

http://www.summitracing.com/parts/SME-90A3900/

[winterstick]

I use a corrugated edge one, it doesn't slip down the bore like my old thin one did
new

old

[rotax racing]

this is what i use. price is right too

http://www.wiseco.com/PDFs/Wiseco-CompressorSleeves.pdf

[01xdime]

this is what i use. price is right too

http://www.wiseco.com/PDFs/Wiseco-CompressorSleeves.pdf

What size do you use Mark? I see 99.00 and 99.50

[Mark S]

The spec on new pistons is 3.9350-3.9360 diameter.

[01xdime]

The spec on new pistons is 3.9350-3.9360 diameter.

Call me stupid but what size do you use?

[Mark S]

I use the one in the link above, which is adjustable from 3.9-4.05...I won't call you stupid either.

[rotax racing]

What size do you use Mark? I see 99.00 and 99.50

i use the 100 mm one. std piston size is 99.94mm. i also modified (bored) another one for oversize pistons

[01xdime]

Thanks Mark. How's business brother?